'Devastated': Tulisa Contostavlos has addressed the sex tape that was leaked online last week, confirming that it is her in the video

Tulisa Contostavlos has taken the brave step of addressing the sex tape that was leaked online earlier this week.Explosively confirming that it is her in the video, the X Factor star speaks of her devastation at the betrayal and places the blame on an ex-boyfriend.'I've never been the type - regardless of being in the public eye - to sit down and keep my mouth shut about anything, especially when I've done nothing wrong,' she says in a five-minute long video, posted on YouTube.

'When you share an intimate moment with someone you love, you never expect this': The singer alleges that the other party in the video is ex-boyfriend Justin Edwards

The 23-year-old singer claims that the other person in the X-rated tape is her ex-boyfriend Justin Edwards, also known as Ultra, who she describes as 'an old school garage MC' and who she alleges is the one behind the video circulating online.Holding up two pictures of the couple during their relationship, Tulisa says: 'Justin is someone who I was seeing from the age of 17 off and on for many years.

'He lied': Tulisa shows pictures of herself and the man she claims has betrayed her

'I practically moved in with him, I loved him deeply, had a lot of respect for him, we talked about kids and marriage. I got my record label to give him a singles deal.''I never expected a scenario like this.'The candid star reveals that the release of the video did not come as a huge surprise to her, after she learned of its existence last year.

'Let you guys decide': Edwards responded an hour later, declaring his intention to 'speak up and lay out the facts'

'I can be honest - about six months ago I got calls from a lot of mutual friends telling me that he had this footage of me that was threatening to bring out for whatever reason - to make money or ruin my career,' she says.'I confronted him and he lied about it, he completely denied it. Now here we are today, and the footage is now circulating online.'As you can imagine, I'm devastated. I'm heartbroken, I've been in bits for the last few days.'When you share an intimate moment with someone you love, that you care about and trust, you never imagine that at any point it will be shared with the rest of the UK or people around the world.

Ex love: Tulisa told fans that she dated Edwards from the age of 17 off and on, and even helped him get a record deal

Tulisa's admission that she confronted her ex about the existence of the tape is at odds with her spokespersons' denial last year.At the time, when it was reported that someone had asked the singer for £50,000 to prevent the video from leaking, her team said: 'This tape is 100 per cent fake and is just someone trying to cash in on her X Factor role.'She is horrified that someone would go to the extreme lengths of fabricating a video. It is absolutely not her. Tulisa has categorically never allowed anyone to film her having sex.'